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Looks like there are salts coming through the render to the left of the circle, so it might not be coming from the parapet wall. Have you had a look in the loft to see if the roof is letting in water around that point?
Edit: assuming yours is the one on the left
Edit 2: which it obviously isn’t because the door on the right is open…
slippers
It's high up so realistically going to need to someone out to look which is a pain.
I wonder if it's anything to do with next door being vacant (for over a year) but it was there in that corner when we first moved in a few years ago and has come back again this winter (though less drastically with us keeping an eye on humidity). Hoping it's just condensation.